Obviously wrong answers for beta cdf

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Dear All,
I am using cdf('beta',x,alp,bet) to compute the cdf of a beta distribution but when alp and bet are less than 1 (where the pdf is u-shaped) it gives obviously wrong answers. For example cdf('beta',0.5,0.0003,.2277) it gives the answer 0.9987.
I do hope you can help. Thanks.
John Hey
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John D'Errico
John D'Errico 2016-8-18
编辑:John D'Errico 2016-8-18
And why do you think that is wrong? Perhaps the obviously wrong thing here is your knowledge of the expected result? That seems not unreasonable as a result. REALLY tiny values of the exponents will give nasty looking beta distributions, with a very heavy tail when only one parameter is small. So you should explain why it is that you think this result is wrong.

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